Panel-board and switch construction



Feb. 5, 1929. 1,700,757

R. B. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 192610 Sheets-Sheet 1 R. B. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Fch. 5, 1929.

10 Sheets-Sheet 2 Filed Feb. 11, 1926 OLINDERWRITIZRSO NAME PLATE NAMEPLATE 0 1 Feb. 5, 1929. 1,700,757

R. B. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 19261o Sheets-Sheet 5 Feb. 5, 1929.

R. B. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 192610 Sheets-Sheet 4 D llllll 2% M M 4 a. z a) 0 6 w 3 4 4 2 I a v ..M Q -QY. 6 2 w 6 m 2 ...,..\m w z 4 a6 a 6 Feb. 5,, 1929.,

R. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 1926 10sheets-sheet- 5 Feb. 5, 11929. 1,700,757

R. B BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 1926 10Sheets-Sheet 6 o :E In: x

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R. s. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION Filed Feb. 11, 192610 Sheets-Sheet 7 Feb. 5, 1929. 35700,?57

R. B. BENJAMIN PANEL BOARD-AND SWITCH CONSTRUCTION Filed Feb. 11, 192610 Sheets-Shet a Feb. 5, 1929. 1,700,757-

R. B. BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTION 10 Sheets-Sheet 10Filed Feb. 11, 1926 R B BENJAMIN PANEL BOARD AND SWITCH CONSTRUCTIONFeb. 5, 1929.

Patented Feb. 5, 1929.

UNITED STATES PATENT OFFICE.

REUBEN B. BENJAMIN, OF CHICAGO, ILLINOIS, ASSIGNOR T BENJAMIN ELECTRICMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PANEL-BOARD AND SWITCH CONSTRUCTION.

Application filed February 11, 1926. Serial No. 87,499.

My invention relates to panel board and switch construction.

One of the objects ofmy invention is to provide an improved constructionwhich can be readily adapted for various circuit arrangements.

A further object is to provide a cheap, durable construction.

Further objects will appear from the description and claims.

In the drawings, in which my invention is illustrated,

Figure 1 is a front View showing the cabinet for housing the panel boardand switch construction;

Fig. 2 is a section on the line 2 2 of Fig. 1;

. Fig. 3 is a section on the line 3-3 of Fig. 2;

Fig. 4 is a front view'of the panel board in the cabinet, showing athree-wire single pole switch, double fuse circuit arrangement;

Fig. 5 is a section on the line 55 of Fig. 4;

Fig. 6 is a front view of the upper section of the panel board withparts broken away;

Fig. 7 is a section on the line 77 of Fig. 6;

Fig. 8 is a View similar to Fig. 6 but showing a three wire, single fusecircuit arrangement;

Fig. 9 is a section along the line 9-9 of Fig. 8;

Fig. 10 is a section along the line 101O of Fig. 8;

Fig. 11 is a horizontal section through a panel board section, showing athree wire, double fuse circuit arrangement;

Fig. 12 is a perspective view showing a name plate mounting;

Fig. 13 is a perspective view of one of the intermediate panel boardsections;

Fig. 14 is a plan view of an intermediate section with the insulatingcover removed and showing all the fuse receptacles of this sectionconnected with the central bus bar for a two wire, single fuse circuitarrangement;

Fig. 15 is a section on the line 1515 of Fig. 14;

Fig. 16 is a bottom view of Fig. 14;

Fig. 17 is a bottom view of a panel board section in which all four ofthe fuse receptacles in the upper horizontal row are connccted with therighthand bus bar and in which all four of the fuse receptacles in thelower horizontal row are connected with the left-hand bus bar for a twowire, double fuse circuit arrangement;

Fig. 18 is a section on the line 18-18 of Fi 17;

ig. 19 is a section on the line 19-19 of Fig. 17; Fig. 20 shows inperspective three auxiliary bus bars used in making the connections forthe various circuits.

Fig. 21 is a perspective view of a section provided with four fusereceptacles and four :mgle pole switches, one for each fuse recepac c;

Fig. 22 is a plan view of the construction shown in Fig. 21, parts beingremoved;

Fig. 23 is a section on the line 23--23 of Fig. 22; s

Fig. 24 is a perspective view of a conductor strip used in connectingone of the switch contacts with the bus bar;

Fig. 25 is a perspective view similar to Fig. 21, but showing two doublepole switches substituted for the four single pole-switches;

Fi 26 is a plan view of the construction of Flg. 25, parts beingremoved;

Fig. 27 is a section on the line 27-27 of Fig. 26;

Fig. 28 is a perspective view of a conductor strip for connecting one ofthe switch contacts with its bus bar;

Fig. 29 is a sectional view of the single pole switch;

Fig. 30 is a bottom view of Fig. 29;

Fig. 31 is a sectional view of the double pole switch;

Fig. 32 is a bottom view of Fig. 31

Fig. 33 is a sectional view on the line 33-33 of Fig. 22 showing theconnections for the single pole switch construction;

Fig. 34 is a section on the lin 3434 of Fig. 26, showing the double poleswitch connections;

Fig. 35 is a section on the line 35-35 of Fig. 26;

Fig. 36 is a diagrammatic view showing a three wire, single pole switch,double fuse circuit arrangement;

Fig. 37 is a diagrammatic view showing a two wire, double fuse circuitarrangement;

Fig. 38 is a diagrammatic view showing a three wire, single pole switch,single fuse clrcuit arrangement;

Fig. 39 is a diagrammatic view showing a three Wire, double fuse circuitarrangement;

Fig. 40 is a diagrammatic View showing a three wire, double pole switch,double fuse circuit arrangement;

Fig. 41 is a diagrammatic view showing'a two wire single fuse circuitarrangement;

Fig. 42 is a diagrammatic view showing a three wire single fuse circuitarrangement;

Fig. 43 is a diagrammatic View showing a three phase circuitarrangement;

Fig. 44 is a diagrammatic View showing a panel board construction havinga metering section;

Fig. 45 is a section on the line 45-45 of Fig. 44;

Fig. 46 is a view showing a panel board COIStlllCtlOIl having afeed-through section; an

Fig. 47 is a section on the line 4747 of Fig. 46.

By proper selection of the various panel board sections shown in detailin Figs. 6 to 35, inclusive, any of the various panel board assembliesshown diagrammatically in Figs. 36 to 42 may be built up.

Referring now to the various circuit arrangements in Figs. 36 to 42,inclusive, in

- the circuits shown in Fig. 36, which is a three wire, single poleswitch double circuit, the upper panel board section has mounted thereonfour fuse receptacles 2 connected to the neutral bus bar 3 by anarrangement such as is shown in Fig. 7. The panel board section 3underneath the upper section carries four-fuse receptacles 2 for thebranch wires and four single pole switches 4, each controlling thecircuit between one of the potential bus bars 5 and one of the fusereceptacles 2. The lower panel board section 6 carries the terminal lugs7 for the main supply wires.

In the circuit arrangement of Fig. 37 the upper panel board sectionmember 8 may carry simply a name plate such as shown in Fig. 12. Theintermediate section 9 has mounted thereon an upper row of four fusereceptacles connected to the left-hand bus bar 10 by an arrangement suchas is shown in Fig. 18 and a lower row of fuse receptacles connectedwith the right-hand bus bar 11 by an arrangement such as shown in theupper part of Fig. 17. The lower block 12v is simply the terminal lugblock.

. In the circuit shown in Fig. 38, which shows a three-wire single poleswitch, single fuse circuitarrangement, the upper block carries simplythe multiple binding plate 13 having the central binding terminal 14 forthe neutral supply wire and the bind ng screws 15 for the unfused branchwires. The intermediate section may be the same as the intermediatesection of Fig. 36, being provide'd with four fuse receptacles for thefused branch Wires and four single pole switches 4, one for each of thefuse receptacles.

In the circuit arrangement of Fig. 39, which shows a three-wire doublefuse circuit arrangement, the upper section has mounted thereon fourfuse receptacles which are connected with the neutral and potential busbars by an arrangement such as is shown in Fig. 11, the two insidereceptacles being both connected with the neutral bus bar and the twooutside fuse receptacles being connected with the potential bus bars,respectively. The intermediate section has mounted thereon eight fusereceptacles also connected with the neutral and potential bus bars by anarrange* ment such as is shown in Fig. 11.

In Fig. 40 which shows a three-wire double pole switch, double fusearrangement, the upper section may carry simply a name plate, as in Fig.37 The intermediate section has mounted thereon four fuse receptaclesfor the branch wires and two double pole switches 16 such as is shown inFig. 25. This intermediate section is the same as the intermediatesection of Figs. 35 and 38, except that two double pole switches aresubstituted for the foursingle pole switches. Each double pole switcheffects a double break in series betweenone branch fuse receptacle andone of the potential bus bars 5 and between another branch fusereceptacle and the neutral bus bar 3.

In Fig. 41, which shows a two-wire single fuse circuit arrangement theupper section may be substantially as shown in Fig. 38 having a centralwire terminal 14 for the supply wire and a plurality of binding screws15 for the unfused branch wires. The intermediate section has mountedthereon eight fuse receptaclesfor the fused wires of the branchcircuits, these being connected with a central supply bus bar 17 by anarrangement such as is shown in Fig. 1.5.

In Fig. 42 which shows a three wire, single fuse circuit arrangement,the upper section may be like that shown in Figs. 6 and 7, havingmounted thereon a multiple binding plate for unfuse'd branch wires andin addition four fuse receptacles for fused branch wires. However, inthis form the fuse receptacles are connected with the potential bus bars5 by an arrangement such as is shown in Fig. 9. The neutral supply wireis connected with the central wiring terminal 14 on the multiple bindingplate, a plurality of binding screws 15 being provided for theconnection of the unfused branch wires. The intermediate section hasmounted thereon eight fuse receptacles which are connected with thepotential shown in Fig: 9.

In Fig. 43 which shows a three phase circuit arrangement the upper,section may carry simply. a name plate. The next secno I bus bars 5 bvan arrangement such. as is tion underneath has mounted thereon eightfuse receptacles. The four fuse receptacles in the upper row of thissection are connected with the right-hand bus bar 18 by an :arrangementsuch as is shown in the upper part of Fig. 17. The four receptacles inthe lower row of this section are connected with the intermediate busbar 19 by an arrangement such as is shown in Fig. 15. The section nextunderneath has mounted thereon eight fuse receptacles, the fourreceptacles in the upper row being connected with the left-hand bus bar20 by an arrangement such as is shown in Fig. 18, and the four fusereceptacles in the lower row being connected with the right-hand bus bar18 by an arrangement such as is shown in the upper part of Fig. 17. Thesection next underneath has mounted thereon eight fuse receptacles, thefour fuse receptacles in the upper row being connected with the centralbus bar 19 by an arrangement such as is shown in Fig. 15, and the fourfuse receptacles in the lower row be ing connected with the left handbus bar 20 by an arrangement such as is shown in Fig. 18.

The various connections from the fuse receptacles to the main bus barsare effected by means of selectively usable transversely extendingauxiliary bus bars, such as shown in Fig. 20, and by means of thealternatively usable interchangeable switch constructions shown indetail in Figs. 25 to 35, inclusive. I will describe first theselectively usable auxiliary bus bar arrangement. For connecting allfour of the fuse receptacles in a horizontal row with either the rightor left hand main bus bars, the auxiliary bus bar 21 is used, as shownin detail in Figs. 17 and 18 and diagrammatically in Figs. 37 and 43. Itwill be noted that the main bus bars lie in the same plane so that thisauxiliary bus bar is provided with an offset portion 22 where it crossesthe main bus bar and an insulating disk or plate 23 is placed betweenthis offset port-ion and the main bus bar 5. The center contacts24 ofthe fuse receptacles are screwed into the auxiliary bus bar 21, and ascrew 25 connects the auxiliary bus bar 21 with the main bus bar 5. Forconnecting two adjacent fuse receptacles of a horizontal row with a busbar located between them, the auxiliary bus bar 26 is used, as shown indetail in Figs. 9 and 11 and diagrammatically in Figs. 39 and 42. Thisis provided with offset ends 27 into which the center contact screws 24of the fuse receptacles are threaded. For connecting the outside fusereceptacles of a horizontal row with the adjacent main bus bar theauxiliary bus bar 28 is used, as shown in Fig. 11. This has an offsetportion 29 into which the center contact of the fuse receptacle isthreaded and is secured to the main bus bar by a screw.

For connecting all four of the fuse receptacles of a horizontal row witha central bus bar, as shown in detail in Figs. 7, 14, 15 and 16 anddiagrammatically in Figs. 41 and 43, an auxiliary bus bar 30 isprovided, the central portion of which is secured to the central bus barby means of a screw, the center contacts of all four of'the fusereceptacles being threaded into the auxiliary bus bar.

Coming now to a description of the interchangeable switch constructionshown in detail in Figs. 25 to 35, inclusive, this construction hasprovisions whereby the four single pole switches 4 can be readilyremoved from the panel board section, and two double pole switches 16substituted therefor when a different circuit arrangement is desired.

Referring first to the single pole switch construction shown in Figs.21, 22, 23, 24, 29, 30 and 33, this comprises four switch units 4mounted 'on the base 31 between the two pairs of fuse receptacles 2 andabove bus bars 3 and 5. Each switch unit controls the circuit betweenone of the side bus bars 5 and one of the fuse receptacles 2, by makingor breaking the circuit at four points in series simultaneously.

Each switch unit comprises an insulating base 32, a switch contact 33electrically connected with one of the side bus bars 5, a switch contact34 electrically connected with the center contact 35 of the fusereceptacle 2, a pair of switch contacts 36 and 37 electrically connectedwith each other, and two sets of oscillatable bridging contacts, one setmaking and breaking connections between the contacts 33 and 36 and theother set making and breaking connections between the contacts 34 and37. Each set of bridging contacts comprises a pair of spring contactmembers 38 secured to an insulating plate 39 oscillatably mounted at 40.These insulating plates are secured together to form a rigidconstruction by means of three connecting rivets 41 extendingtherebetween and riveted thereto. The bridging members are operated bymeans of an oscillatable switch lever 42 connected with one of therivets by means of a coil tension spring 43. As the switch lever 42 isoperated, it swings the tension spring from one side to the other of thedead center and causes the bridging members to oscillate with a snapaction. In order to give a final kick-off to the bridging member in caseit sticks, a pair of fingers 44 are provided on the switch lever whichengage the spring as the switch lever is moved.

The two contacts 36 and 37 which are electrically connected with eachother may be formed as an integral part of a metal stamping having atransversely extending portion 45 which provides the electricalconnect-ion. The other two contacts 33 and 34 are molded into theinsulating base 32 and each is provided with a sleeve portion 46 throughwhich a screw 47 may extend for securing it to the f panel board. Thescrew 47 for the contact 33 which is electrically connected with theside bus bar 5 is threaded into this bus bar and to further insure agood electrical connection between the contact and the bus bar. aU-shaped conductor strip 48 (Figs. 24 and 33) is provided extending fromthe sleeve 46 to the bus bar 5. This strip is first formed as shown infull lines in Fig. 24 and after. it is inserted in place in the base 31,has its end bent over, as shown in Fig. 33 and also in dotted lines inFig. 24, to secure it in position. The sleeve portion 46 of the contactwhich is connected with the center contact- 35 of the fuse receptacle,seats on an extension 49 of this center contact and is firmly held inengagement therewith by means of a securing screw 47 threaded into saidextension.

The double pole switch construction shown in Figs. 25, 26, 27, 28, 31,32, 34 and 35 is similar in many respects to the single pole switchconstruction just described. The bridging member and switch lever areexactly the same in both constructions as are also the contacts 33 and34 on the right-hand side of Figs. 29, 30, 31 and 32. However, a pair ofunconnected switch contacts 50 and 51 are substituted for the connectedcontacts 36 and 37 shown at the left of Fig. 29. Each of theseunconnected contacts is provided with a foot portion 52, one of whichiselectrically connected with one of the side bus bars 5 by means of aconductor strap 48 on which foot portion 52 is clamped by means of ascrew 53 which is threaded into the bus bar 5 and serves to secure theswitch mechanism to the panel board. 1 The other foot portion 52 iselectrically connected with a side bus bar 5 by means of a conductorstrap 54, against which the foot portion 52 is clamped by means of ascrew 55 (Fig. 35), and a conductor strap 48 against which the other endof the conductor strap 54 is clamped by means of a screw 55 threadedinto the bus bar 5. Each of the contacts 33 and 34 is clamped againstthe extension of the center, contact 35 by means of a screw 47 extendingthrough the sleeve 46 of the contact and threaded into the extension ofthe center contact, as shown in Figs. 27 and 34.

As stated above, it will be noted that the panel board has provisions bymeans of which either single pole switches 4 or double pole switches 16can be secured thereto. In the single pole construction the circuit isfrom one of the side bus bars 5 through either the screw 47 or theU-shaped conductor 48 to the sleeve 46, fixed switch contact 33 throughthe bridging members 38 to the contact 36,

and through the transversely extending conductor 45 to -the othercontact 37, through the other set of bridging members-38 to the otherfixed contact 34, and thence to the extension 49 of the center cont-actof the fuse receptacle. This single pole switch thus provides for foursimultaneous breaks in series between the bus bar 5 and its associatedfuse receptacle 2.

In the double pole switch construction one set of bridging memberscontrols the circuit from one of the side bus bars 5 through either thescrew 55 or the U-shaped conductor strap 48 to the conductor 54, throughthe fixed contact 50 and bridgingmembers 38 to the fixed contact 33 withwhich the center contact 35 of the fuse receptacle is connected. Theother set of bridging members controls the circuit from the central busbar to the center contact of one of the fuse receptacles through thescrew 53, contact 51, bridging member 38, and contact 34, which iselectrically connected with the center contact of the fuse receptacle.

One side of the double pole switch thus effects a double break in seriesbetween an outside bus bar and the center contact of one of the fusereceptacles and the other side of the double pole switch effects adouble break in series between the bus bar 3 and the'center contact ofanother of the fuse receptacles.

Referring further in detail to the panel board and the various panelboard sections, the construction shown comprises a sheet metal cabinet56, in which the panel board is mounted, provided with a large door 57which permits access to the entire panel board, and with a small door 58which permits access to the switches for the branch circuits.

The sections of the panel board are mounted on Vertical Z-bars 59secured to the back of the cabinet by nuts 60 threaded on the studs 61.In the three-wire, single pole switch, double fuse circuit arrangementshown in Fig. 4, the two upper sections of the panel board have mountedthereon the fuse receptacles which are connected with the centralneutral bus bar. The three sections underneath the upper two sectionshave mounted on the right-hand side the fuse receptacles and switchesassociated with the right-hand potential bus bar and on the left-handside the fuse receptacles and switches associated with the left-hand busbar. The fuse receptacles on the two upper sections are connected withthe central neutral bus bar 3 by means of auxiliary bus bars 30 arrangedas shown in Fig. 7 the auxiliary bus bar being secured to the neutralbus bar by means of the screw and the center contact screws of the fusereceptacles being threaded into the transversely extending auxiliary busbars.

The threaded shell contacts 62 of the fuse receptacles are seated indeep recesses in the Insulating base, shoulders being provided in eachrecess on which outwardly extending flanges or cars 63 of. the shellcontact rest. One ear or flange of each shell contact is provided with abinding terminal 64 to which a wire of the branch circuit .is secured.The

insulating base is provided with suitable passages for the branch wiresleading from these binding terminals to the edge of the panel board. Theconstruction of the switch carrying section is shown in detail in Figs.21, 22 and 23 and has heretofore been described. Each single pole switchcontrols the circuit between one of the branch fuse receptacles and oneof the potential bus bars.

If it is desired to use but a single fuse in each branch circuit, anarrangement such as shown in Figs. 6, 8, 41 and 42 may be used. In thisarrangement, a multiple binding terminal construction is provided towhich all of the unfused' branch wires are connected, a central bindingtermina-l construction 14 being provided for the main supply line. Thepanel board section which carries this multiple binding plate memberalso carries four fuse receptacles to furnish part of the fuses for thefused wires of the branch circuit. This multiple binding plate may bemounted in a suitable recess 66 in the upper edge of theinsulating baseof the upper section; a plurality. of binding screws 15 for the un fusedbranch wires are screwed into this binding plate. I

In circuits such as shown in Figs. 37 and 40, where the upper sectioncarries simply the name plates, these may be mounted on a cover member67 supported on a bracket 68 resting on the Z-bars 59.

In order to cover up the wiring terminals and present a finishedappearance, covers 69 of suitable sheet material may be provided infront of the panel board sections, this cover having openings for thefuse receptacles and switches, but covering the wiring terminals.

Figs. 44 and 45 show a three-wire singlepole switch single fuse circuitarrangement having a metering section 70 provided with terminal lugs 71for the connections 7 2 for the meter 7 8, the arrangement otherwisebeing substantially as shown and described in connection with Fig. 38.

Figs. 46 and 47 show a three-wire singlepole switch single fuse circuitarrangement having a feed-through section 7 4 having terminal lugs 75for connection with a succeeding panel board construction and having busbars 76 for connection with the neutral branch wires which areelectrically connected with the neutral supply bus bar by means ofU-shaped clips 77 and screws 78 extending through openings in the branchbus bars and U-shaped clips and screwed into the neutral supply bus bar.

I claim:

1. A fuse receptacle and switch construction comprising a base, twopotential bus bars and a neutral bus bar parallel to each other, theneutral bar being between the other two, a pair of fuse receptaclesadjacent the negative bus bar, another pair of fuse receptacles adjacentthe positive bus bars, and four independently operable switches, one foreach fuse receptacle, for controlling the circuit between each fusereceptacle and its adjacent bus bar, said construction having provisionswhereby the switches may be readily removed, and a pair of switchessubstituted therefor, each of which substituted switches controls thecircuit between the neutral bus bar and one of the fuse receptacles andbetween a potential bus bar and another of the fuse receptacles.

2. A panel board construetion comprising a neutral bus bar, a positivebus bar, and a negative bus bar, said bus bars extending parallel toeach other, the neutral bus bar being between the other two, aninsulating base member extending across said bus bars, a transverse rowof four fuse receptacles mounted on said base section. and auxiliary busbar means, whereby all of the receptacles in the row may be connectedwith the central neutral bus bar if desired, or whereby some may beconnected with one potential bus bar and others with the other potentialbus bar, if desired, or whereby some may be connected to the potentialbus bars and the others to the neutral bus bar, if desied, all of saidmain bus bars and auxiliary bus bars being mounted on the rear face ofsaid base.

3. A panel board construction comprising an insulating base having.provisions for mounting thereon in parallel arrangement a positive busbar, a negative bus bar and a neutral bus bar between the other busbars, a transverse row of fuse receptacles mounted on said base section,and auxiliary bus bar means whereby all of the receptacles in a row maybe connected with a neutral bus bar, if desired, or whereby some may beconnected with one potential bus bar, and others with another potentialbus bar, or whereby some may be connected to potential bus bars and someto a neutral bus bar, all of said main bus bars,and auxiliar bus barsbeing mounted on the rear face 0 said base.

4. A panel board construction comprising an insulating base havingprovisions for mounting thereon in parallel arrangement apositive busbar, a negative bus bar, and a neutral bus bar between the other busbars, a transverse row of four fuse receptacles mounted on said basesection and auxiliary bus bar means whereby all of the receptacles insaid row may be connected with one of said bus bars, if desired, orwhereby some may be connected with one of said bus bars and others withanother of said bus bars, all of said main bus bars and auxiliary busbars being mounted on the rear face of said base.

5. A panel board construction comprising an insulating base havingprovisions for mounting thereon in parallel arrangement a positive busbar, a negative bus bar, and a neutral bus bar between the other busbars,

a transverse row of four fuse receptacles mounted on said base sectionand auxiliary bus bar means whereby all of the receptacles in said rowmay be connected with one of said bus bars, if desired, or whereby somemay be connected with one of said bus bars and others with another ofsaid bus bars all of said main bus bars and auxiliary bus bars beingmounted on the rear face of said base, said main bus bars lyingsubstantiall in the same plane and one of said auxiliary us bars havinga portion in contact with its supply bus bar, and an offset ortion whereit crosses another of the main bus bars.

6. A panel board construction comprising an insulating base havingprovisions for mountin thereon in parallel arrangement a positive usbar, a negative bus bar, and a neutral bus bar between the other busbars, a

transverse 'row of four fuse' receptacles mounted on said base sectionand auxiliary bus bar means whereby all of the receptacles in said rowmay be connected with one of said bus bars, if desired, or whereby somemay be connected with one of said bus bars and others with another ofsaid bus bars, all of said main bus bars and auxiliary bus bars beingmounted on the rear face of said base, said main bus bars lyingsubstantially in the same plane and one of said auxiliary bus barshaving a portion in contact with its supply bus bar, and an offsetportion where it crosses another of the main bus bars, and an insulatingdisk between said offset portion and said other main bus bar.

In Witness whereof, I have hereunto subscribed my name.

REUBEN B. BENJAMIN.

